Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8a5329af0d725e…

MALICIOUS

PDF

103.9 KB Created: 2021-03-28 08:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 3ea105d0874e15fdd4451c5613770d26 SHA-1: 0ce01f89e7e7de416d863d09206dd9c52947083b SHA-256: aa8a5329af0d725e7ea3e456b06d9aa673c3cd02864f9e065701d79c915d44b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, appears to be a lure related to search terms, directing users to potentially malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/award?keyword=auto+mechanics+for+dummies+pdf PDF link annotation
    • https://cdn.sqhk.co/sesudegaruta/oDSSkQL/alley_cropping.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/MheYidy/kendall_and_kylie_park_combat_boots.pdfIn PDF document text
    • http://dewodalaluw.mygamesonline.org/fujeguva.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/babexinapazeximomano.pdfIn PDF document text
    • https://cdn.sqhk.co/rirakibugo/hhnvihI/shark_ion_robot_r75_manual.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/arkanaut_ironclad.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/h0ihgjz/bixileminenem.pdfIn PDF document text
    • https://cdn.sqhk.co/mutuwatu/oicviea/kumenewesuko.pdfIn PDF document text
    • https://cdn.sqhk.co/toriwogadej/jlsQ4hc/rizobazepixubu.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/g6giibs/kitawusijezapesunari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://donolipapaxe.rf.gd/whatsapp_status_shayari_video_free.pdfIn PDF document text
    • http://gixejemazob.myartsonline.com/74527154441.pdfIn PDF document text
    • http://kunijudodo.rf.gd/anatomy_a_regional_atlas_of_the_human_body.pdfIn PDF document text
    • http://fijumusuxolegoj.atwebpages.com/2239134543.pdfIn PDF document text
    • http://vekifaxofezawe.epizy.com/recommendation_letter_for_scholarship_from_employer.pdfIn PDF document text
    • http://poxelisenaxoxig.epizy.com/902212162.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/enemy_pie_read_aloud.pdfIn PDF document text
    • http://bexovivuvere.myartsonline.com/xebileva.pdfIn PDF document text
    • http://tetexabe.epizy.com/zebagobekipowusireturoje.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BEA 5236 bytes
SHA-256: ac218602766b364ad7400eb0be7396eaf695de6972f6ee79e9ee71283ee71f9c
font_01_sfnt_off00015d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D8F 11368 bytes
SHA-256: 2349149b5cf7cd44a0f41f7d3a7ab86c8cae99b6ba8ad222560680b9a1987d14
font_02_sfnt_off00018429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18429 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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